001 /*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.jet.codegen;
018
019 import com.google.common.collect.ImmutableMap;
020 import org.jetbrains.annotations.NotNull;
021 import org.jetbrains.annotations.Nullable;
022 import org.jetbrains.jet.lang.descriptors.CallableDescriptor;
023 import org.jetbrains.jet.lang.descriptors.ClassifierDescriptor;
024 import org.jetbrains.jet.lang.psi.*;
025 import org.jetbrains.jet.lang.resolve.DescriptorUtils;
026 import org.jetbrains.jet.lang.resolve.name.FqName;
027 import org.jetbrains.jet.lang.resolve.name.Name;
028 import org.jetbrains.jet.lang.types.JetType;
029 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
030 import org.jetbrains.jet.lang.types.lang.PrimitiveType;
031
032 import java.util.List;
033
034 import static org.jetbrains.jet.codegen.AsmUtil.isPrimitiveNumberClassDescriptor;
035 import static org.jetbrains.jet.lang.types.lang.KotlinBuiltIns.BUILT_INS_PACKAGE_FQ_NAME;
036
037 public class RangeCodegenUtil {
038 private static final ImmutableMap<FqName, PrimitiveType> RANGE_TO_ELEMENT_TYPE;
039 private static final ImmutableMap<FqName, PrimitiveType> PROGRESSION_TO_ELEMENT_TYPE;
040
041 static {
042 ImmutableMap.Builder<FqName, PrimitiveType> rangeBuilder = ImmutableMap.builder();
043 ImmutableMap.Builder<FqName, PrimitiveType> progressionBuilder = ImmutableMap.builder();
044 for (PrimitiveType primitiveType : PrimitiveType.values()) {
045 FqName rangeClassFqName = BUILT_INS_PACKAGE_FQ_NAME.child(Name.identifier(primitiveType.getTypeName() + "Range"));
046 FqName progressionClassFqName = BUILT_INS_PACKAGE_FQ_NAME.child(Name.identifier(primitiveType.getTypeName() + "Progression"));
047 rangeBuilder.put(rangeClassFqName, primitiveType);
048 progressionBuilder.put(progressionClassFqName, primitiveType);
049 }
050 RANGE_TO_ELEMENT_TYPE = rangeBuilder.build();
051 PROGRESSION_TO_ELEMENT_TYPE = progressionBuilder.build();
052 }
053
054 private RangeCodegenUtil() {}
055
056 public static boolean isRange(JetType rangeType) {
057 return !rangeType.isNullable() && getPrimitiveRangeElementType(rangeType) != null;
058 }
059
060 public static boolean isProgression(JetType rangeType) {
061 return !rangeType.isNullable() && getPrimitiveProgressionElementType(rangeType) != null;
062 }
063
064 @Nullable
065 public static BinaryCall getRangeAsBinaryCall(@NotNull JetForExpression forExpression) {
066 // We are looking for rangeTo() calls
067 // Other binary operations will succeed too, but will be filtered out later (by examining a resolvedCall)
068 JetExpression rangeExpression = forExpression.getLoopRange();
069 assert rangeExpression != null;
070 JetExpression loopRange = JetPsiUtil.deparenthesize(rangeExpression);
071 if (loopRange instanceof JetQualifiedExpression) {
072 // a.rangeTo(b)
073 JetQualifiedExpression qualifiedExpression = (JetQualifiedExpression) loopRange;
074 JetExpression selector = qualifiedExpression.getSelectorExpression();
075 if (selector instanceof JetCallExpression) {
076 JetCallExpression callExpression = (JetCallExpression) selector;
077 List<? extends ValueArgument> arguments = callExpression.getValueArguments();
078 if (arguments.size() == 1) {
079 return new BinaryCall(qualifiedExpression.getReceiverExpression(), callExpression.getCalleeExpression(),
080 arguments.get(0).getArgumentExpression());
081 }
082 }
083 }
084 else if (loopRange instanceof JetBinaryExpression) {
085 // a rangeTo b
086 // a .. b
087 JetBinaryExpression binaryExpression = (JetBinaryExpression) loopRange;
088 return new BinaryCall(binaryExpression.getLeft(), binaryExpression.getOperationReference(), binaryExpression.getRight());
089
090 }
091 return null;
092 }
093
094 @Nullable
095 private static PrimitiveType getPrimitiveRangeElementType(JetType rangeType) {
096 return getPrimitiveRangeOrProgressionElementType(rangeType, RANGE_TO_ELEMENT_TYPE);
097 }
098
099 @Nullable
100 private static PrimitiveType getPrimitiveProgressionElementType(JetType rangeType) {
101 return getPrimitiveRangeOrProgressionElementType(rangeType, PROGRESSION_TO_ELEMENT_TYPE);
102 }
103
104 @Nullable
105 private static PrimitiveType getPrimitiveRangeOrProgressionElementType(
106 @NotNull JetType rangeOrProgression,
107 @NotNull ImmutableMap<FqName, PrimitiveType> map
108 ) {
109 ClassifierDescriptor declarationDescriptor = rangeOrProgression.getConstructor().getDeclarationDescriptor();
110 assert declarationDescriptor != null;
111 if (declarationDescriptor != KotlinBuiltIns.getInstance().getBuiltInsPackageScope().getClassifier(declarationDescriptor.getName())) {
112 // Must be a standard library class
113 return null;
114 }
115 return map.get(DescriptorUtils.getFqNameSafe(declarationDescriptor));
116 }
117
118 public static boolean isOptimizableRangeTo(CallableDescriptor rangeTo) {
119 if ("rangeTo".equals(rangeTo.getName().asString())) {
120 if (isPrimitiveNumberClassDescriptor(rangeTo.getContainingDeclaration())) {
121 return true;
122 }
123 }
124 return false;
125 }
126
127 public static class BinaryCall {
128 public final JetExpression left;
129 public final JetExpression op;
130 public final JetExpression right;
131
132 private BinaryCall(JetExpression left, JetExpression op, JetExpression right) {
133 this.left = left;
134 this.op = op;
135 this.right = right;
136 }
137 }
138 }